Understanding Hazardous and Explosion-Protection Environments
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1 Understanding Hazardous and Explosion-Protection Environments Explosions occur when a mixture of oxygen and explosive substances develop into explosive gases. When the concentration of a substance in air is within the lower and upper explosive limits the mixture can be ignited. To prevent an explosion one of three prerequisites must be eliminated. Making equipment ignition free and safe to install in an explosive environment is one solution. Categorizing Explosive Environments Zone 0 An area where an explosive atmosphere consisting of a mixture of air containing flammable substances in the form of gas, liquid or vapor is continuously and/or frequently present Zone 1 An area where an explosive atmosphere consisting of a mixture of air containing flammable substances in the form of gas, liquid or vapor is likely to occur under normal conditions. Zone 2 An area where an explosive atmosphere consisting of a mixture of air containing flammable substances in the form of gas, liquid or vapor is not likely to occur under normal conditions. If it occurs it will only be for short periods of time.
2 Various Applications for Explosion-Proof, Explosion-Safe and Harsh Environments
3 Classification Examples of Hazardous Areas Gases/Vapors Where there is a tank filled with flammable liquid there is the potential risk for an explosion to occur inside the tank. Therefore the inside of the tank is categorized as Zone 0. Vapor may occasionally escape through a vent on the top of the tank, therefore the area around the vent is categorized as Zone 1. The vapor may also run down the outside of the tank resulting in another potentially explosive environment which is categorized as Zone 2.
4 Dust At a mill with a feed hoper and filter, for example, a product that causes dust particles mixed with sufficient air to cause an inflammable mixture is loaded into a hopper. Inside the hopper and filter is categorized as Zone 20. While the product is being loaded the mixture of dust and air causes a potentially explosive compound in the area where the product is loaded into the hopper so the area outside the hopper is categorized as Zone 21. Around the hoper where a potentially inflammable atmosphere temporarily exists is categorized as Zone 22.
5 Relationship of IEC, CENELEC, NEC 505 and NEC 500 IEC: International Electrotechnical Commission CENELEC: European Committee for Electrotechnical Standardization NEC: National Electrical Code IP Protection Rate: Index of Ingress Protection IP69K is the German DIN PART9 standard. It is defined as a protection regulation for high temperature and high-pressurized water. Water is heated to 80 C and sprayed at a water pressure in the range from 80 to 100 bars at 14 to 16 liters per minute at the test object. The test object is at a distance of 100 to 150 mm from the nozzle and sprayed in all directions at 0, 30, 60 and 90 degrees, then sprayed at a horizontal angle while it is being rotated. This is done for a period of 30 seconds without being affected by water penetration. PATLITE understands Explosion Proof, Explosion-Safe and Intrinsically-Safe application needs, and offers visual and audible signaling solutions, as well as LED illumination work lights, to help maximize safety and productivity in these work environments.
6 ABOUT PATLITE Founded in 1947, PATLITE is a leading provider of innovative LED status indicating lights, sound alarms, visual and audible communication network systems and solutions which enhance the safety, security and comfort of workplaces and communities. The company s products and services help improve the quality control, productivity and safety of industrial automation, commercial, municipal and governmental customers. PATLITE has more than 600 employees and the wholly-owned sales subsidiaries in the USA, Germany, Singapore, Korea, and China. For more information visit sales@patlite.com or call
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